You were lucky. Whenever I take the dog out I get sinister helicopters operating entirely in silent mode tracking me across the countryside. They are using some sort of VaccineChip tracking device whilst remaining totally invisible above the clouds.I gotr the same one as you, on 30 Jan.
No side effects that I noticed, not even an immediate feeling of invulnerability, possibly because I was still mired in a deep trough of lockdown-amplified Seasonal Affective Disorder, which was significantly abated with the arrival of false spring over the weekend before last.
I am afraid. Not being able to see or hear them adds enormously to my sense of helplessness and fearful despair.